Asynchronous block for Arduino

Files to part 2 in Makerzone articles about Arduino and the Sharp IR sensor.

This submission includes the files used in this article (https://www.hackster.io/matlab-makers/ir-proximity-sensors-with-simulink-and-arduino-part-2-bc15cf). It is a library with an asynchronous block that can be used to catch interrupts on an Arduino board with some models files as examples of how to use it with the Sharp IR sensor.